$$15+( \frac{ 28-18 }{ 2 \times 28-18-17 } ) \times 5$$
$\frac{365}{21}\approx 17.380952381$
$$15+\frac{10}{2\times 28-18-17}\times 5$$
$$15+\frac{10}{56-18-17}\times 5$$
$$15+\frac{10}{38-17}\times 5$$
$$15+\frac{10}{21}\times 5$$
$$15+\frac{10\times 5}{21}$$
$$15+\frac{50}{21}$$
$$\frac{315}{21}+\frac{50}{21}$$
$$\frac{315+50}{21}$$
$$\frac{365}{21}$$
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$\frac{5 \cdot 73}{3 \cdot 7} = 17\frac{8}{21} = 17.38095238095238$
